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The valve springs of an automobile engine are made of No.8 W&M gauge wire with an outside diameter of 1 1/8 in. The...

  1. The valve springs of an automobile engine are made of No.8 W&M gauge wire with an outside diameter of 1 1/8 in. The spring load is 43 lb at a spring length of 2.25 in. (valve closed) and 96 lb at a length of 1 29/32 in. (valve open). There are seven effective coils. (a) Determine the maximum stress in the wire. (b) Determine the modulus of rigidity of the wire material. (c) Determine the open length of the spring.
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